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Role of Discretization Parameters in Source Depth Estimation Using Tikhonov’s Downwards Continuation of Potential Fields
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 5
Abstract
Downward continuation of potential fields is an important tool in their interpretation - depths of shallowest important sources can be determined by means of stable downward continuation algorithms. In this contribution we analyse the properties of one from these algorithms (based on Tikhonov’s regularization approach) from the scope of two most important discretization parameters - dimensions of the areal coverage of the interpreted field and the sampling interval size. We show on one synthetic body (sphere) and one real-world data-set (results from a microgravity survey for cavities detection) that there is a need for a relatively large surroundings around the interpreted anomaly. Beside of this also the sampling step plays its important role - grids with finer sampling steps give better interpretation results, when using this method. From this point of view, this method is more suitable for the interpretation of objects in near surface and mining geophysics (anomalies from cavities, unexploded ordnance objects and ore bodies).